‘Syracuse’ M20: The Wide-Ratio Benchmark
The Muncie M20 is a smooth-shifting, wide-ratio 4-speed — engineered for street cruising, restorations, and lighter builds. With global-quality components and AutoGear durability, it’s a modern classic ready for the road.
Whether you’re building a daily driver, a classic cruiser, or a period-correct muscle car, the M20 brings effortless shifts and long-lasting performance — all in the original Muncie footprint.
Why Choose the M20?
✅ Smooth, predictable RPM drop between shifts
✅ Supercase standard with 9310-equivalent countershaft
✅ OEM-friendly install footprint for easy retrofits
✅ Durable, quiet operation for road use
✅ Ideal for lighter builds or street-first restorations
Gear Ratio Packages
| Model | 1st Gear | 2nd Gear | 3rd Gear | 4th Gear | Best For |
|---|---|---|---|---|---|
| M20 | 2.52 | 1.88 | 1.46 | 1.00 | Street cruising & lighter loads |
| M20W | 2.56 | 1.75 | 1.36 | 1.00 | Daily driver & resto builds |
| M20Z | 2.98 | 2.04 | 1.46 | 1.00 | 3.08–3.36 gears, torque builds |
Additional ratio codes available (314, 324, etc.) — Contact us to find your match.
What You Get
- ‘Muncie’ install footprint — reuse clutch, shifter, driveshaft
- Masiero Italian gears — rarely equaled, never bested
- N-Series Supercase + mainshaft — rugged, vibration-resistant aluminum
- Controlled-clearance synchros + Kyowa rings — smooth shifts under pressure
- Oil-sealed, torsion-cushioned 26-spline inputs for shock protection
- Cast and machined in the USA with aircraft-grade aluminum
The M20 Legacy
In 1957, GM reignited America’s passion for four-speed performance. By 1963, the first Muncie was born — and by 1966, the M20 had become a refined, reliable wide-ratio transmission found in everything from Corvettes to Camaros.
Today’s ‘Syracuse’ M20 carries that legacy forward. Built on decades of innovation, our version is stronger, smoother, and smarter — with the same footprint you know and trust.
Resources
View documents and resources related to this gearbox in the resource center.
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